Telephone receiver



April 2 1, 1925 1 534911 R. C. BROWNE v TELEPHONE RECEIVER Filed March12, 1925 To all whom it may concern:

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Patented Apr. 21, 1925.

UNITED STATES PATENT oF cE.

RALPH C. IBROKIIYI'E, OF SALEM, MASSACHUSETTS.

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Application filed March 12, 1923. Serial No. 624,510.

pecially adapted for use with radio. It is,

of course, to be understood that, without material modification oralteration, the apparatus is applicable for other useswhere amplifyingof sound waves is desired.

One of the objects of the present mventlon is to provide instruments ofthe above general character which will produce tones true in character,great in volume, andcapable of great accuracy.

A furtheizobject is to provide a telephone receiver of the abovecharacter which may be inexpensively manufactured and assem bled.

A further object is to provide a'receiver of the above character havingrelativelv few parts which will render the'same light and compact,whereby it may be conveniently transported.

A further object is to provide a deviceof the above characterparticularly adapted for use with radio sets for amplifying andreproducing sound waves in a clear and distinct ratus of the abovegeneral character which will be more eflicient and reliable in use inthat the damping effects of 'the magnetic field are eliminated as muchas possible and the intensity of the reproduced sound is increased. 1 I

Other objects will be in part obvious from the annexed drawing and inpart indicated from the following analysis of the'invention.

The inventionaccordmgly consists in the features of construction,combination of parts, and in the unique .relation of the vaing anddispositioning thereof, all as more clearly outlined herein.

To enable others skilled in the art to fully comprehend the underlyingfeatures thereof in order that they may embody the same, by numerousmodifications in structure and relation contemplated by this invention,drawings de icting the preferred forms have been annexe as part of thisdisclosure and in such drawings like characters of reference indicatecorresponding parts throughout all the views, of which Figure 1 is asemi-diagrammatic perspective view of such parts of the invention as arenecessary tofully understand the invention Figure 2 is a centralsectional view of a slight modification;

Figure 3 is detail view showing certain parts diagrammatically; and

Figure 4 is a conventional diagram. of'the device ina transformercircuit.

Referring now to the drawings in detail, and more particularly Figure 1,5 indicates an electro-magnet, one .pole piece of which is indicated at6 and a part of the other one at 7. These pole pieces are taperedtowards their adjacent edges, as indicated at 8, and

the effective adjacent surfaces '10 of each curves relativelydownwardly, as shown more clearly in Figure 2. I wish the term'effective surfaces to be given a broad interpretation. While, of course,certain lines of force will be set up between the tapered portions 8 ofthe pole pieces the maximum portion of the field will extend betweenthese adj acent parallel curved surfaces 10. These surfaces are curveddownwardly to conform" with a correspondingly curved conductor 11, Ihave found, by experience, that by curving the conductor in this manner,perfect results are obtained, and a louder, more efficient and clearertone is produced. The curvature or bend permits the conductor to bevibrated freely as the same is underno tension. This enables theconductor to vibrate uniformly with the wave of the telephonic current,and

when connected directly to the diaphragm also frees the latter from anyundesirable tension; This conductor 11 may be mounted as shown in Figure2, that is, between an insulated binding post 12 and the diaphragm 13,or, if preferred, the conductor 11 may be supported by spring brackets14 secured as shown in Figure 1, and the central part where the maximumvibrations occur is connected by means of a vertically disposed rod 15,which is connected to a second connecting member 16 interposed between arelatively fixed and insulated binding post 17 and the diaphragm 18,shown in Figure 1. Both the members 11 and 16 are positioned substanto,and insulated from, the polepieces 6 and rious members and therelativeproportion- 7 tially parallel and in the same vertical plane,the central parts of each being connected by the-link or connecting bar15, although this is not absolutely necessary, for obviously the member16 might be turned 90 or any fractional part thereof, horizontally aboutthe end of the member 15 as a pivot point. The point that'should beemphasized and borne in mind primarily is the connecting of the members11 and 16 by the member 15 at their central parts, whereby the greatestamplification or vibration of one will be transmitted to the other witha corresponding effect on thediaphragm 18. 15

With this arrangement and peculiar construction of the pole pieces, Ifind that a'telephonic current entering and allowed to traverse theconductor 11 will cause the same to be thrown into vibration insynchronism with the polarization or wave. of the telehonic current.The'magnetic field set up etween the-pole pieces 6 and 7 is localized toconform to the curvature of the vibrating conductor 11 and stray andeddying lines of force which produce damping effects are eliminated. Itwill be noted that the vibra-s tions occurring in the conductor 11' havetwo components, that-is, transverse, and longitudinal. Thelongitudinal'components are utilized in either moving the diaphragm13directly, as iii-Figure 2, or indirectly through the'connecting-links,as in Figures 1 and '3.

, the tones reproduced are of great volume and more true in character,and also require less energy. in field current.

Without further analysis, the foregoing will so fully reveal the gist ofthis invention that others can, by applying current knowledge, re'adilyadapt it for various applications without omitting certain featuresthat, from the standpoint of the prior art, fairly constitute essentialcharacteristics ofthe generic or specific aspects .of this inventionand, therefore, such adaptations should and are intended to becomprehendedwithin the meaning and range of equivalency of the followingclaims.

I claim:

1. A telephone receiver comprising two oppositely disposed pole piecesadapted to create a magnetic? field therebetween, a single conductorwithin said field, a diaphragm,

, and means connecting said diaphragm with said conductor comprising amember centrally connected with the diaphragm and a member extendingbetween said first member and said conductor.

2. A telephone receiver comprising oppositely disposed pole piecesadapted to create a magnetic field therebetween, a conductor positionedin said field and a diaphragm connected with said conductor, saidconductor being curved and the adjacent surfaces of the pole piecesbeing parallel and curved correspondingly to the curvature of saidconductor throughout their effective lengths.

3. A telephone receiver comprising two pole pieces for forming amagnetic field therebetween, a single conductor positioned in saidfield, a diaphragm adapted to be actuated by vibration of the conductor,the adjacent surfaces of said pole pieces and conductor beingcorrespondingly curved and parallel throughout their respective lengths.

4. A telephone receiver comprising two oppositely disposed pole pieces,the adjacent surfaces of which are parallel and curved throughout theireffective length, said pole pieces adapted to create a magnetic fieldbetween said adjacent surfaces, a single conductor positioned in saidfield and curved to conform with the curvature of the adjacent surfacesof said pole pieces, whereby the magnetic field set up is concentratedalong the length of said conductor.

5. A telephone receiver comprising oppositely disposed poles, tapered toa relatively narrowface, for creating amagnetic field therebetween, saidpoles having their adja-' cent faces parallel, one of the poles beingcurved throughout its effective face length.

6. 'A telephone receiver comprising oppositely disposed pole pieceshavin their adjacent faces parallel and adapted to create a magneticfield therebetween, one' of said pole piecesbeing curved in thedirection of its effective face length, and a conductor po sitionedwithinsaid field.

7. A telephone, receiver comprising oppositely disposed poles forcreating a magnetic field therebetween the adjacent surfaces of saidpole pieces being parallel, one

of said pole pieces being curved throughout its effective length, and aconductor positioned within said field, said'conductorbeingcurvedthroughout its lengtlr corresponding to the curvature of saidpole piece. 8. A telephone receiver comprising 0 po-' sitely disposedpole pieces tapered to orm relatively narrow faces for creating amagnetic field therebetween, a conductor extending transversely throughsaid magnetic field, said conductor and the adjacent faces of said polepieces being parallel and correspondingly curved in the direction oftheir eflective lengths.

Leeann 9. A telephone receiver comprising oppositely disposed polepieces for creating a magnetic field therebetween, a conductor extendingtransversely through said magnetic field, the adjacent surfaces of saidpole pieces and said-conductor being correspondingly curved throughouttheir effective lengths, and a diaphragm adapted to be actuated byvibrations of said conductor.

10. A telephone receiver comprising oppositely disposed pole pieces forcreating a magnetic field therebetween, a single conductor extendingtransversely through said magnetic field, the adjacent surfaces of saidpole pieces and said conductor being correspondingly curved throughouttheir effective lengths, and a diaphragm adapted to be actuated byvibrations of said conductor, said diaphragm being positioned atsubstantially right angles to the length of said conductor.

11. A telephone receiver comprising oppositely disposed pole pieces forcreating a magnetic field therebetween, a bent conductor extendingtransversely through said magnetic field, the adjacent surfaces of saidpole pieces being parallel and curved to conform to the curvature ofsaid conductor throughout their effective lengths, and a diaphragmadapted to be actuated by vibrations of said conductor, said diaphragmsbeing positioned at substantially right angles to the length of saidconductor, and two intermediate members positioned at substantiallyright angles to each other connecting said diaphragm with the conductor.

12. A telephone receiver comprising oppositely disposed pole pieces forcreating a magnetic field therebetween, a conductor extendingtransversely through said magnetic field, the adjacent surfaces of saidpole pieces being parallel and curved throughout their entire lengths,

and a diaphragm adapted to-be actuated by vibrations of said conductor,said diaphragm being positioned,

at substantially right angles to the length of said conductor, and twointermediate members positioned at substantially right. angles to eachother connecting said diaphragm with the conductor, one of said membersbeing substantially parallel to said cundUCtOl'.

13. A telephone receiver comprising two oppositely disposed pole pieces,the adjacent surfaces of which are parallel and curved throughout theirefiective lengths, thereby to create an intensified magnetic fieldthercbetween, and a conductor correspondingly curved and positionedbetween said adjacent faces of said pole pieces, spring supports for theopposite ends of said conductor, a diaphragm and connecting meansbetween the diaphragm and said conductor.

l l. A telephone receiver comprising two oppositely disposed polepieces, the adjacent surfaces of which are parallel and curvedthroughout their effective lengths, thereby to create an intensifiedmagnetic field therebetween, and a conductor correspondingly curved andpositioned between said adjacent faces of said pole pieces, springsupports for the opposite ends of said 0011-' ductor, a diaphragnr andconnecting means between the diaphragm and said conductor, saidconducting means comprising a member secured to said diaphragm andpositioned substantially parallel to said conductor, and a memberconnecting'the central parts of said conductor and said first mentionedconnecting member.

In witness whereof I have hereunto signed my name.

RALPH C. BROWNE.

